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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '480ffc92c9cb1945fa48702e48366f7ab535063d605bec669ee9e79b79f45e38' 
  AND token = '+VbzYgKo8q14kEP+33gi/Ztd1HX7ofomkGfZxN0JylM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}